ci: Alternative CodeQL C++ build

.github/workflows/codeql-analysis.yml

@@ -54,15 +54,6 @@ jobs:
         # Prefix the list here with "+" to use these queries and those in the config file.
         # queries: ./path/to/local/query, your-org/your-repo/queries@main
 
-    # Autobuild attempts to build any compiled languages  (C/C++, C#, or Java).
-    # If this step fails, then you should remove it and run the build manually (see below)
-    - name: Autobuild
-      if: matrix.language != 'cpp'
-      uses: github/codeql-action/autobuild@v1
-
-    # ℹ️ Command-line programs to run using the OS shell.
-    # 📚 https://git.io/JvXDl
-
     - name: Cache Conan data
       if: matrix.language == 'cpp'
       uses: actions/cache@v2
@@ -80,16 +71,23 @@ jobs:
       uses: actions/setup-python@v2
       with:
         python-version: '3.8'
-    - name: Conan build
+    - name: Conan install
       if: matrix.language == 'cpp'
       run: |
         pip install -U conan
         conan config init
         conan remote add upload ${{ secrets.CONAN_UPLOAD }}
         conan remote add linear-algebra https://api.bintray.com/conan/twonington/public-conan
-        mkdir build && cd build
+        mkdir _lgtm_build_dir && cd _lgtm_build_dir
         conan install .. -s compiler.cppstd=20 -s compiler.libcxx=libstdc++11 -o mp-units:generate_docs=False -e mp-units:CONAN_RUN_TESTS=True -b outdated -u
-        conan build ..
+
+    # Autobuild attempts to build any compiled languages  (C/C++, C#, or Java).
+    # If this step fails, then you should remove it and run the build manually (see below)
+    - name: Autobuild
+      uses: github/codeql-action/autobuild@v1
+
+    # ℹ️ Command-line programs to run using the OS shell.
+    # 📚 https://git.io/JvXDl
 
     - name: Perform CodeQL Analysis
       uses: github/codeql-action/analyze@v1